Definitions

1. adjective

relating to or affecting the mucous membranes of the body, especially the respiratory, gastrointestinal, and genitourinary tracts

“The mucosal immune system helps protect the body against infections and diseases.”

2. noun

the mucous membranes of the body, especially the respiratory, gastrointestinal, and genitourinary tracts

“The mucosa of the nose and throat produce mucus to trap dust and other foreign particles.”